"Early into the investigation we identified a potential offender, carrying out numerous enquiries to trace and locate the individual. Extensive enquiries have been conducted, including the use of facial mapping, ultimately eliminating him from the investigation.

"We are determined that the person responsible for this crime is brought to justice and I am now appealing to the public for help.

"While no weapons were seen, the offender has robbed a bank and in the process - through the medium of the written word - threatened to shoot staff if they did not comply."